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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
/**
* @fileoverview Date/Time parsing library with locale support
*/
var gadgets = gadgets || {};
gadgets.i18n = gadgets.i18n || {};
/**
* DateTimeParse is for parsing date in a locale-sensitive manner. It allows
* user to use any customized patterns to parse date-time string under certain
* locale. Things varies across locales like month name, weekname, field
* order, etc.
*
* This module is the counter-part of DateTimeFormat. They use the same
* date/time pattern specification, which is borrowed from ICU/JDK.
*
* This implementation could parse partial date/time.
*
* Time Format Syntax: To specify the time format use a time pattern string.
* In this pattern, following letters are reserved as pattern letters, which
* are defined as the following:
*
* <pre>
* Symbol Meaning Presentation Example
* ------ ------- ------------ -------
* G era designator (Text) AD
* y# year (Number) 1996
* M month in year (Text & Number) July & 07
* d day in month (Number) 10
* h hour in am/pm (1~12) (Number) 12
* H hour in day (0~23) (Number) 0
* m minute in hour (Number) 30
* s second in minute (Number) 55
* S fractional second (Number) 978
* E day of week (Text) Tuesday
* D day in year (Number) 189
* a am/pm marker (Text) PM
* k hour in day (1~24) (Number) 24
* K hour in am/pm (0~11) (Number) 0
* z time zone (Text) Pacific Standard Time
* Z time zone (RFC 822) (Number) -0800
* v time zone (generic) (Text) Pacific Time
* ' escape for text (Delimiter) 'Date='
* '' single quote (Literal) 'o''clock'
* </pre>
*
* The count of pattern letters determine the format. <p>
* (Text): 4 or more pattern letters--use full form,
* less than 4--use short or abbreviated form if one exists.
* In parsing, we will always try long format, then short. <p>
* (Number): the minimum number of digits. <p>
* (Text & Number): 3 or over, use text, otherwise use number. <p>
* Any characters that not in the pattern will be treated as quoted text. For
* instance, characters like ':', '.', ' ', '#' and '@' will appear in the
* resulting time text even they are not embraced within single quotes. In our
* current pattern usage, we didn't use up all letters. But those unused
* letters are strongly discouraged to be used as quoted text without quote.
* That's because we may use other letter for pattern in future. <p>
*
* Examples Using the US Locale:
*
* Format Pattern Result
* -------------- -------
* "yyyy.MM.dd G 'at' HH:mm:ss vvvv" ->> 1996.07.10 AD at 15:08:56 Pacific Time
* "EEE, MMM d, ''yy" ->> Wed, July 10, '96
* "h:mm a" ->> 12:08 PM
* "hh 'o''clock' a, zzzz" ->> 12 o'clock PM, Pacific Daylight Time
* "K:mm a, vvv" ->> 0:00 PM, PT
* "yyyyy.MMMMM.dd GGG hh:mm aaa" ->> 01996.July.10 AD 12:08 PM
*
* <p> When parsing a date string using the abbreviated year pattern ("yy"),
* DateTimeParse must interpret the abbreviated year relative to some
* century. It does this by adjusting dates to be within 80 years before and 20
* years after the time the parse function is called. For example, using a
* pattern of "MM/dd/yy" and a DateTimeParse instance created on Jan 1, 1997,
* the string "01/11/12" would be interpreted as Jan 11, 2012 while the string
* "05/04/64" would be interpreted as May 4, 1964. During parsing, only
* strings consisting of exactly two digits, as defined by {@link
* java.lang.Character#isDigit(char)}, will be parsed into the default
* century. Any other numeric string, such as a one digit string, a three or
* more digit string will be interpreted as its face value.
*
* <p> If the year pattern does not have exactly two 'y' characters, the year is
* interpreted literally, regardless of the number of digits. So using the
* pattern "MM/dd/yyyy", "01/11/12" parses to Jan 11, 12 A.D.
*
* <p> When numeric fields abut one another directly, with no intervening
* delimiter characters, they constitute a run of abutting numeric fields. Such
* runs are parsed specially. For example, the format "HHmmss" parses the input
* text "123456" to 12:34:56, parses the input text "12345" to 1:23:45, and
* fails to parse "1234". In other words, the leftmost field of the run is
* flexible, while the others keep a fixed width. If the parse fails anywhere in
* the run, then the leftmost field is shortened by one character, and the
* entire run is parsed again. This is repeated until either the parse succeeds
* or the leftmost field is one character in length. If the parse still fails at
* that point, the parse of the run fails.
*
* <p> Now timezone parsing only support GMT:hhmm, GMT:+hhmm, GMT:-hhmm
*
*/
/**
* Construct a DateTimeParse object based on current locale by using
* the symbol table passed in.
* @constructor
*/
gadgets.i18n.DateTimeParse = function(symbol) {
this.symbols_ = symbol;
};
/**
* Year.
* @type {number}
*/
gadgets.i18n.DateTimeParse.prototype.year = 0;
/**
* Month.
* @type {number}
*/
gadgets.i18n.DateTimeParse.prototype.month = 0;
/**
* Day of month.
* @type {number}
*/
gadgets.i18n.DateTimeParse.prototype.dayOfMonth = 0;
/**
* Hours.
* @type {number}
*/
gadgets.i18n.DateTimeParse.prototype.hours = 0;
/**
* Minutes.
* @type {number}
*/
gadgets.i18n.DateTimeParse.prototype.minutes = 0;
/**
* Seconds.
* @type {number}
*/
gadgets.i18n.DateTimeParse.prototype.seconds = 0;
/**
* Milliseconds.
* @type {number}
*/
gadgets.i18n.DateTimeParse.prototype.milliseconds = 0;
/**
* Number of years prior to now that the century used to
* disambiguate two digit years will begin
*
* @type {number}
*/
gadgets.i18n.DateTimeParse.ambiguousYearCenturyStart = 80;
/**
* Apply a pattern to this Parser. The pattern string will be parsed and saved
* in "compiled" form.
* Note: this method is somewhat similar to the pattern parsing methold in
* datetimeformat. If you see something wrong here, you might want
* to check the other.
* @param {string} pattern It describes the format of date string that need to
* be parsed.
*/
gadgets.i18n.DateTimeParse.prototype.applyPattern = function(pattern) {
this.patternParts_ = [];
var inQuote = false;
var buf = '';
for (var i = 0; i < pattern.length; i++) {
var ch = pattern.charAt(i);
// handle space, add literal part (if exist), and add space part
if (ch == ' ') {
if (buf.length > 0) {
this.patternParts_.push({text: buf, count: 0, abutStart: false});
buf = '';
}
this.patternParts_.push({text: ' ', count: 0, abutStart: false});
while (i + 1 < pattern.length && pattern.charAt(i + 1) == ' ') {
i++;
}
} else if (inQuote) {
// inside quote, except '', just copy or exit
if (ch == '\'') {
if (i + 1 < pattern.length && pattern.charAt(i + 1) == '\'') {
// quote appeared twice continuously, interpret as one quote.
buf += ch;
++i;
} else {
// exit quote
inQuote = false;
}
} else {
// literal
buf += ch;
}
} else if (gadgets.i18n.DateTimeParse.PATTERN_CHARS_.indexOf(ch) >= 0) {
// outside quote, it is a pattern char
if (buf.length > 0) {
this.patternParts_.push({text: buf, count: 0, abutStart: false});
buf = '';
}
var count = this.getNextCharCount_(pattern, i);
this.patternParts_.push({text: ch, count: count, abutStart: false});
i += count - 1;
} else if (ch == '\'') {
// Two consecutive quotes is a quote literal, inside or outside of quotes.
if (i + 1 < pattern.length && pattern.charAt(i + 1) == '\'') {
buf += "'";
i++;
} else {
inQuote = true;
}
} else {
buf += ch;
}
}
if (buf.length > 0) {
this.patternParts_.push({text: buf, count: 0, abutStart: false});
}
this.markAbutStart_();
};
/**
* Apply a predefined pattern to this Parser.
* @param {number} formatType A constant used to identified the predefined
* pattern string stored in locale repository.
* @return {void} nothing
*/
gadgets.i18n.DateTimeParse.prototype.applyStandardPattern = function(formatType)
{
var pattern;
// formatType constants are defined in a way so that following resolution is
// possible.
if (formatType < 4) {
pattern = this.symbols_.DATEFORMATS[formatType];
} else if (formatType < 8) {
pattern = this.symbols_.TIMEFORMATS[formatType - 4];
} else if (formatType < 12) {
pattern = this.symbols_.DATEFORMATS[formatType - 8];
pattern += ' ';
pattern += this.symbols_.TIMEFORMATS[formatType - 8];
} else {
return this.applyStandardPattern(gadgets.i18n.MEDIUM_DATETIME_FORMAT);
}
return this.applyPattern(pattern);
};
/**
* Parse the given string and fill info into date object. This version does
* not validate the input.
* @param {string} text The string being parsed.
* @param {number} start The position from where parse should begin.
* @param {Date} date The Date object to hold the parsed date.
* @return {number} How many characters parser advanced.
*/
gadgets.i18n.DateTimeParse.prototype.parse = function(text, start, date) {
return this.internalParse_(text, start, date, false);
};
/**
* Parse the given string and fill info into date object.
* @param {string} text The string being parsed.
* @param {number} start The position from where parse should begin.
* @param {Date} date The Date object to hold the parsed date.
* @param {boolean} validation If true, input string need to be a valid
* date/time string.
* @return {number} How many characters parser advanced.
* @private
*/
gadgets.i18n.DateTimeParse.prototype.internalParse_ =
function(text, start, date, validation) {
var cal = new gadgets.i18n.DateTimeParse.MyDate_();
var parsePos = [start];
// For parsing abutting numeric fields. 'abutPat' is the
// offset into 'pattern' of the first of 2 or more abutting
// numeric fields. 'abutStart' is the offset into 'text'
// where parsing the fields begins. 'abutPass' starts off as 0
// and increments each time we try to parse the fields.
var abutPat = -1; // If >=0, we are in a run of abutting numeric fields
var abutStart = 0;
var abutPass = 0;
for (var i = 0; i < this.patternParts_.length; ++i) {
if (this.patternParts_[i].count > 0) {
if (abutPat < 0 && this.patternParts_[i].abutStart) {
abutPat = i;
abutStart = start;
abutPass = 0;
}
// Handle fields within a run of abutting numeric fields. Take
// the pattern "HHmmss" as an example. We will try to parse
// 2/2/2 characters of the input text, then if that fails,
// 1/2/2. We only adjust the width of the leftmost field; the
// others remain fixed. This allows "123456" => 12:34:56, but
// "12345" => 1:23:45. Likewise, for the pattern "yyyyMMdd" we
// try 4/2/2, 3/2/2, 2/2/2, and finally 1/2/2.
if (abutPat >= 0) {
// If we are at the start of a run of abutting fields, then
// shorten this field in each pass. If we can't shorten
// this field any more, then the parse of this set of
// abutting numeric fields has failed.
var count = this.patternParts_[i].count;
if (i == abutPat) {
count -= abutPass;
abutPass++;
if (count == 0) {
// tried all possible width, fail now
return 0;
}
}
if (!this.subParse_(text, parsePos, this.patternParts_[i], count,
cal)) {
// If the parse fails anywhere in the run, back up to the
// start of the run and retry.
i = abutPat - 1;
parsePos[0] = abutStart;
continue;
}
}
// Handle non-numeric fields and non-abutting numeric fields.
else {
abutPat = -1;
if (!this.subParse_(text, parsePos, this.patternParts_[i], 0, cal)) {
return 0;
}
}
} else {
// Handle literal pattern characters. These are any
// quoted characters and non-alphabetic unquoted
// characters.
abutPat = -1;
// A run of white space in the pattern matches a run
// of white space in the input text.
if (this.patternParts_[i].text.charAt(0) == ' ') {
// Advance over run in input text
var s = parsePos[0];
this.skipSpace_(text, parsePos);
// Must see at least one white space char in input
if (parsePos[0] > s) {
continue;
}
} else if (text.indexOf(this.patternParts_[i].text, parsePos[0]) ==
parsePos[0]) {
parsePos[0] += this.patternParts_[i].text.length;
continue;
}
// We fall through to this point if the match fails
return 0;
}
}
// return progress
return cal.calcDate_(date, validation) ? parsePos[0] - start : 0;
};
/**
* Calculate character repeat count in pattern.
*
* @param {string} pattern It describes the format of date string that need to
* be parsed.
* @param {number} start the position of pattern character.
*
* @return {number} Repeat count.
* @private
*/
gadgets.i18n.DateTimeParse.prototype.getNextCharCount_ =
function(pattern, start) {
var ch = pattern.charAt(start);
var next = start + 1;
while (next < pattern.length && pattern.charAt(next) == ch) {
++next;
}
return next - start;
};
/**
* All acceptable pattern characters.
* @private
*/
gadgets.i18n.DateTimeParse.PATTERN_CHARS_ = 'GyMdkHmsSEDahKzZv';
/**
* Pattern characters that specify numerical field.
* @private
*/
gadgets.i18n.DateTimeParse.NUMERIC_FORMAT_CHARS_ = 'MydhHmsSDkK';
/**
* Check if the pattern part is a numeric field.
*
* @param {Object} part pattern part to be examined.
*
* @return {boolean} true if the pattern part is numberic field.
* @private
*/
gadgets.i18n.DateTimeParse.prototype.isNumericField_ = function(part) {
if (part.count <= 0) {
return false;
}
var i = gadgets.i18n.DateTimeParse.NUMERIC_FORMAT_CHARS_.indexOf(
part.text.charAt(0));
return i > 0 || i == 0 && part.count < 3;
};
/**
* Identify the start of an abutting numeric fields' run. Taking pattern
* "HHmmss" as an example. It will try to parse 2/2/2 characters of the input
* text, then if that fails, 1/2/2. We only adjust the width of the leftmost
* field; the others remain fixed. This allows "123456" => 12:34:56, but
* "12345" => 1:23:45. Likewise, for the pattern "yyyyMMdd" we try 4/2/2,
* 3/2/2, 2/2/2, and finally 1/2/2. The first field of connected numeric
* fields will be marked as abutStart, its width can be reduced to accomodate
* others.
*
* @private
*/
gadgets.i18n.DateTimeParse.prototype.markAbutStart_ = function() {
// abut parts are continuous numeric parts. abutStart is the switch
// point from non-abut to abut
var abut = false;
for (var i = 0; i < this.patternParts_.length; i++) {
if (this.isNumericField_(this.patternParts_[i])) {
// if next part is not following abut sequence, and isNumericField_
if (!abut && i + 1 < this.patternParts_.length &&
this.isNumericField_(this.patternParts_[i + 1])) {
abut = true;
this.patternParts_[i].abutStart = true;
}
} else {
abut = false;
}
}
};
/**
* Skip space in the string.
*
* @param {string} text input string.
* @param {Array} pos where skip start, and return back where the skip stops.
* @private
*/
gadgets.i18n.DateTimeParse.prototype.skipSpace_ = function(text, pos) {
var m = text.substring(pos[0]).match(/^\s+/);
if (m) {
pos[0] += m[0].length;
}
};
/**
* Protected method that converts one field of the input string into a
* numeric field value.
*
* @param {string} text the time text to be parsed.
* @param {Array} pos Parse position.
* @param {Object} part the pattern part for this field.
* @param {number} digitCount when > 0, numeric parsing must obey the count.
* @param {Object} cal MyDate_ object that will hold parsed value.
*
* @return {boolean} True if it parses successfully.
* @private
*/
gadgets.i18n.DateTimeParse.prototype.subParse_ =
function(text, pos, part, digitCount, cal) {
this.skipSpace_(text, pos);
var start = pos[0];
var ch = part.text.charAt(0);
// parse integer value if it is a numeric field
var value = -1;
if (this.isNumericField_(part)) {
if (digitCount > 0) {
if ((start + digitCount) > text.length) {
return false;
}
value = this.parseInt_(
text.substring(0, start + digitCount), pos);
} else {
value = this.parseInt_(text, pos);
}
}
switch (ch) {
case 'G': // ERA
cal.era = this.matchString_(text, pos, this.symbols_.ERAS);
return true;
case 'M': // MONTH
return this.subParseMonth_(text, pos, cal, value);
case 'E':
return this.subParseDayOfWeek_(text, pos, cal);
case 'a': // AM_PM
cal.ampm = this.matchString_(text, pos, this.symbols_.AMPMS);
return true;
case 'y': // YEAR
return this.subParseYear_(text, pos, start, value, part, cal);
case 'd': // DATE
cal.day = value;
return true;
case 'S': // FRACTIONAL_SECOND
return this.subParseFractionalSeconds_(value, pos, start, cal);
case 'h': // HOUR (1..12)
if (value == 12) {
value = 0;
}
case 'K': // HOUR (0..11)
case 'H': // HOUR_OF_DAY (0..23)
case 'k': // HOUR_OF_DAY (1..24)
cal.hours = value;
return true;
case 'm': // MINUTE
cal.minutes = value;
return true;
case 's': // SECOND
cal.seconds = value;
return true;
case 'z': // ZONE_OFFSET
case 'Z': // TIMEZONE_RFC
case 'v': // TIMEZONE_GENERIC
return this.subparseTimeZoneInGMT_(text, pos, cal);
default:
return false;
}
};
/**
* Parse year field. Year field is special because
* 1) two digit year need to be resolved.
* 2) we allow year to take a sign.
* 3) year field participate in abut processing.
*
* @param {string} text the time text to be parsed.
* @param {Array} pos Parse position.
* @param {number} start where this field start.
* @param {number} value integer value of year.
* @param {Object} part the pattern part for this field.
* @param {Object} cal MyDate_ object that will hold parsed value.
*
* @return {boolean} True if successful.
* @private
*/
gadgets.i18n.DateTimeParse.prototype.subParseYear_ =
function(text, pos, start, value, part, cal) {
var ch;
if (value < 0) {
//possible sign
ch = text.charAt(pos[0]);
if (ch != '+' && ch != '-') {
return false;
}
pos[0]++;
value = this.parseInt_(text, pos);
if (value < 0) {
return false;
}
if (ch == '-') {
value = -value;
}
}
// only if 2 digit was actually parsed, and pattern say it has 2 digit.
if (ch == null && (pos[0] - start) == 2 && part.count == 2) {
cal.setTwoDigitYear_(value);
} else {
cal.year = value;
}
return true;
};
/**
* Parse Month field.
*
* @param {string} text the time text to be parsed.
* @param {Array} pos Parse position.
* @param {Object} cal MyDate_ object that will hold parsed value.
* @param {number} value numeric value if this field is expressed using
* numeric pattern, or -1 if not.
*
* @return {boolean} True if parsing successful.
* @private
*/
gadgets.i18n.DateTimeParse.prototype.subParseMonth_ =
function(text, pos, cal, value) {
// when month is symbols, i.e., MMM or MMMM, value will be -1
if (value < 0) {
// Want to be able to parse both short and long forms.
// Try count == 4 first:
value = this.matchString_(text, pos, this.symbols_.MONTHS);
if (value < 0) { // count == 4 failed, now try count == 3
value = this.matchString_(text, pos, this.symbols_.SHORTMONTHS);
}
if (value < 0) {
return false;
}
cal.month = value;
return true;
} else {
cal.month = value - 1;
return true;
}
};
/**
* Parse Day of week field.
* @param {string} text the time text to be parsed.
* @param {Array} pos Parse position.
* @param {Object} cal MyDate_ object that holds parsed value.
*
* @return {boolean} True if successful.
* @private
*/
gadgets.i18n.DateTimeParse.prototype.subParseDayOfWeek_ =
function(text, pos, cal) {
// Handle both short and long forms.
// Try count == 4 (DDDD) first:
var value = this.matchString_(text, pos, this.symbols_.WEEKDAYS);
if (value < 0) {
value = this.matchString_(text, pos, this.symbols_.SHORTWEEKDAYS);
}
if (value < 0) {
return false;
}
cal.dayOfWeek = value;
return true;
};
/**
* Parse fractional seconds field.
*
* @param {number} value parsed numberic value.
* @param {Array} pos current parse position.
* @param {number} start where this field start.
* @param {Object} cal MyDate_ object that holds parsed value.
*
* @return {boolean} True if successful.
* @private
*/
gadgets.i18n.DateTimeParse.prototype.subParseFractionalSeconds_ =
function(value, pos, start, cal) {
// Fractional seconds left-justify
var len = pos[0] - start;
cal.milliseconds = len < 3 ? value * Math.pow(10, 3 - len) :
Math.round(value / Math.pow(10, len - 3));
return true;
};
/**
* Parse GMT type timezone.
*
* @param {string} text the time text to be parsed.
* @param {Array} pos Parse position.
* @param {Object} cal MyDate_ object that holds parsed value.
*
* @return {boolean} True if successful.
* @private
*/
gadgets.i18n.DateTimeParse.prototype.subparseTimeZoneInGMT_ =
function(text, pos, cal) {
// First try to parse generic forms such as GMT-07:00. Do this first
// in case localized DateFormatZoneData contains the string "GMT"
// for a zone; in that case, we don't want to match the first three
// characters of GMT+/-HH:MM etc.
// For time zones that have no known names, look for strings
// of the form:
// GMT[+-]hours:minutes or
// GMT[+-]hhmm or
// GMT.
if (text.indexOf('GMT', pos[0]) == pos[0]) {
pos[0] += 3; // 3 is the length of GMT
return this.parseTimeZoneOffset_(text, pos, cal);
}
// TODO(shanjian): check for named time zones by looking through the locale
// data from the DateFormatZoneData strings. should parse both short and long
// forms.
// subParseZoneString(text, start, cal);
// As a last resort, look for numeric timezones of the form
// [+-]hhmm as specified by RFC 822. This code is actually
// a little more permissive than RFC 822. It will try to do
// its best with numbers that aren't strictly 4 digits long.
return this.parseTimeZoneOffset_(text, pos, cal);
};
/**
* Parse time zone offset.
*
* @param {string} text the time text to be parsed.
* @param {Array} pos Parse position.
* @param {Object} cal MyDate_ object that holds parsed value.
*
* @return {boolean} True if successful.
* @private
*/
gadgets.i18n.DateTimeParse.prototype.parseTimeZoneOffset_ =
function(text, pos, cal) {
if (pos[0] >= text.length) {
cal.tzOffset = 0;
return true;
}
var sign = 1;
switch (text.charAt(pos[0])) {
case '-': sign = -1; // fall through
case '+': pos[0]++;
}
// Look for hours:minutes or hhmm.
var st = pos[0];
var value = this.parseInt_(text, pos);
if (value == 0 && pos[0] == st) {
return false;
}
var offset;
if (pos[0] < text.length && text.charAt(pos[0]) == ':') {
// This is the hours:minutes case
offset = value * 60;
pos[0]++;
st = pos[0];
value = this.parseInt_(text, pos);
if (value == 0 && pos[0] == st) {
return false;
}
offset += value;
} else {
// This is the hhmm case.
offset = value;
// Assume "-23".."+23" refers to hours.
if (offset < 24 && (pos[0] - st) <= 2)
offset *= 60;
else
// todo: this looks questionable, should have more error checking
offset = offset % 100 + offset / 100 * 60;
}
offset *= sign;
cal.tzOffset = -offset;
return true;
};
/**
* Parse a integer string and return integer value.
*
* @param {string} text string being parsed.
* @param {Array} pos parse position.
*
* @return {number} Converted integer value.
* @private
*/
gadgets.i18n.DateTimeParse.prototype.parseInt_ = function(text, pos) {
var m = text.substring(pos[0]).match(/^\d+/);
if (!m) {
return -1;
}
pos[0] += m[0].length;
return parseInt(m[0], 10);
};
/**
* Attempt to match the text at a given position against an array of strings.
* Since multiple strings in the array may match (for example, if the array
* contains "a", "ab", and "abc", all will match the input string "abcd") the
* longest match is returned.
*
* @param {string} text The string to match to.
* @param {Array} pos parsing position.
* @param {Array} data The string array that is used to found match from.
*
* @return {number} the new start position if matching succeeded; a negative
* number indicating matching failure.
* @private
*/
gadgets.i18n.DateTimeParse.prototype.matchString_ = function(text, pos, data) {
// There may be multiple strings in the data[] array which begin with
// the same prefix (e.g., Cerven and Cervenec (June and July) in Czech).
// We keep track of the longest match, and return that. Note that this
// unfortunately requires us to test all array elements.
var bestMatchLength = 0;
var bestMatch = -1;
var lower_text = text.substring(pos[0]).toLowerCase();
for (var i = 0; i < data.length; ++i) {
var len = data[i].length;
// Always compare if we have no match yet; otherwise only compare
// against potentially better matches (longer strings).
if (len > bestMatchLength &&
lower_text.indexOf(data[i].toLowerCase()) == 0) {
bestMatch = i;
bestMatchLength = len;
}
}
if (bestMatch >= 0) {
pos[0] += bestMatchLength;
}
return bestMatch;
};
/**
* This class hold the intermediate parsing result. After all fields are
* consumed, final result will be resolved from this class.
* @constructor
* @private
*/
gadgets.i18n.DateTimeParse.MyDate_ = function() {
};
/**
* 2 digit year special handling. Assuming for example that the
* defaultCenturyStart is 6/18/1903. This means that two-digit years will be
* forced into the range 6/18/1903 to 6/17/2003. As a result, years 00, 01, and
* 02 correspond to 2000, 2001, and 2002. Years 04, 05, etc. correspond
* to 1904, 1905, etc. If the year is 03, then it is 2003 if the
* other fields specify a date before 6/18, or 1903 if they specify a
* date afterwards. As a result, 03 is an ambiguous year. All other
* two-digit years are unambiguous.
*
* @param {number} year 2 digit year value before adjustment.
* @return {number} disambiguated year
* @private
*/
gadgets.i18n.DateTimeParse.MyDate_.prototype.setTwoDigitYear_ = function(year)
{
var now = new Date();
var defaultCenturyStartYear =
now.getFullYear() - gadgets.i18n.DateTimeParse.ambiguousYearCenturyStart;
var ambiguousTwoDigitYear = defaultCenturyStartYear % 100;
this.ambiguousYear = (year == ambiguousTwoDigitYear);
year += Math.floor(defaultCenturyStartYear / 100) * 100 +
(year < ambiguousTwoDigitYear ? 100 : 0);
return this.year = year;
};
/**
* Based on the fields set, fill a Date object. For those fields that not
* set, use the passed in date object's value.
*
* @param {Date} date Date object to be filled.
* @param {boolean} validation If true, input string will be checked to make
* sure it is valid.
*
* @return {boolean} false if fields specify a invalid date.
* @private
*/
gadgets.i18n.DateTimeParse.MyDate_.prototype.calcDate_ =
function(date, validation) {
// year 0 is 1 BC, and so on.
if (this.era != undefined && this.year != undefined &&
this.era == 0 && this.year > 0) {
this.year = -(this.year - 1);
}
if (this.year != undefined) {
date.setFullYear(this.year);
}
// The setMonth and setDate logic is a little tricky. We need to make sure
// day of month is smaller enough so that it won't cause a month switch when
// setting month. For example, if data in date is Nov 30, when month is set
// to Feb, because there is no Feb 30, JS adjust it to Mar 2. So Feb 12 will
// become Mar 12.
var org_date = date.getDate();
date.setDate(1); // every month has a 1st day, this can actually be anything
// less than 29.
if (this.month != undefined) {
date.setMonth(this.month);
}
if (this.day != undefined) {
date.setDate(this.day);
} else {
date.setDate(org_date);
}
if (this.hours == undefined) {
this.hours = date.getHours();
}
// adjust ampm
if (this.ampm != undefined && this.ampm > 0) {
if (this.hours < 12) {
this.hours += 12;
}
}
date.setHours(this.hours);
if (this.minutes != undefined) {
date.setMinutes(this.minutes);
}
if (this.seconds != undefined) {
date.setSeconds(this.seconds);
}
if (this.milliseconds != undefined) {
date.setMilliseconds(this.milliseconds);
}
// If validation is needed, verify that the uncalculated date fields
// match the calculated date fields. We do this before we set the
// timezone offset, which will skew all of the dates.
//
// Don't need to check the day of week as it is guaranteed to be
// correct or return false below.
if (validation &&
(this.year != undefined && this.year != date.getFullYear() ||
this.month != undefined && this.month != date.getMonth() ||
this.dayOfMonth != undefined && this.dayOfMonth != date.getDate() ||
this.hours >= 24 || this.minutes >= 60 || this.seconds >= 60 ||
this.milliseconds >= 1000)) {
return false;
}
// adjust time zone
if (this.tzOffset != undefined) {
var offset = date.getTimezoneOffset();
date.setTime(date.getTime() + (this.tzOffset - offset) * 60 * 1000);
}
// resolve ambiguous year if needed
if (this.ambiguousYear) { // the two-digit year == the default start year
var defaultCenturyStart = new Date();
defaultCenturyStart.setFullYear(
defaultCenturyStart.getFullYear() -
gadgets.i18n.DateTimeParse.ambiguousYearCenturyStart);
if (date.getTime() < defaultCenturyStart.getTime()) {
date.setFullYear(defaultCenturyStart.getFullYear() + 100);
}
}
// dayOfWeek, validation only
if (this.dayOfWeek != undefined) {
if (this.day == undefined) {
// adjust to the nearest day of the week
var adjustment = (7 + this.dayOfWeek - date.getDay()) % 7;
if (adjustment > 3) {
adjustment -= 7;
}
var orgMonth = date.getMonth();
date.setDate(date.getDate() + adjustment);
// don't let it switch month
if (date.getMonth() != orgMonth) {
date.setDate(date.getDate() + (adjustment > 0 ? -7 : 7));
}
} else if (this.dayOfWeek != date.getDay()) {
return false;
}
}
return true;
};
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